203     CMSHeap
 204   };
 205 
 206   static inline size_t filler_array_max_size() {
 207     return _filler_array_max_size;
 208   }
 209 
 210   virtual Name kind() const = 0;
 211 
 212   virtual const char* name() const = 0;
 213 
 214   /**
 215    * Returns JNI error code JNI_ENOMEM if memory could not be allocated,
 216    * and JNI_OK on success.
 217    */
 218   virtual jint initialize() = 0;
 219 
 220   // In many heaps, there will be a need to perform some initialization activities
 221   // after the Universe is fully formed, but before general heap allocation is allowed.
 222   // This is the correct place to place such initialization methods.
 223   virtual void post_initialize() = 0;
 224 
 225   // Stop any onging concurrent work and prepare for exit.
 226   virtual void stop() {}
 227 
 228   // Stop and resume concurrent GC threads interfering with safepoint operations
 229   virtual void safepoint_synchronize_begin() {}
 230   virtual void safepoint_synchronize_end() {}
 231 
 232   void initialize_reserved_region(HeapWord *start, HeapWord *end);
 233   MemRegion reserved_region() const { return _reserved; }
 234   address base() const { return (address)reserved_region().start(); }
 235 
 236   virtual size_t capacity() const = 0;
 237   virtual size_t used() const = 0;
 238 
 239   // Return "true" if the part of the heap that allocates Java
 240   // objects has reached the maximal committed limit that it can
 241   // reach, without a garbage collection.
 242   virtual bool is_maximal_no_gc() const = 0;
 243 

 518 
 519   // Requires "addr" to be the start of a chunk, and returns its size.
 520   // "addr + size" is required to be the start of a new chunk, or the end
 521   // of the active area of the heap.
 522   virtual size_t block_size(const HeapWord* addr) const = 0;
 523 
 524   // Requires "addr" to be the start of a block, and returns "TRUE" iff
 525   // the block is an object.
 526   virtual bool block_is_obj(const HeapWord* addr) const = 0;
 527 
 528   // Returns the longest time (in ms) that has elapsed since the last
 529   // time that any part of the heap was examined by a garbage collection.
 530   virtual jlong millis_since_last_gc() = 0;
 531 
 532   // Perform any cleanup actions necessary before allowing a verification.
 533   virtual void prepare_for_verify() = 0;
 534 
 535   // Generate any dumps preceding or following a full gc
 536  private:
 537   void full_gc_dump(GCTimer* timer, bool before);



 538  public:
 539   void pre_full_gc_dump(GCTimer* timer);
 540   void post_full_gc_dump(GCTimer* timer);
 541 
 542   VirtualSpaceSummary create_heap_space_summary();
 543   GCHeapSummary create_heap_summary();
 544 
 545   MetaspaceSummary create_metaspace_summary();
 546 
 547   // Print heap information on the given outputStream.
 548   virtual void print_on(outputStream* st) const = 0;
 549   // The default behavior is to call print_on() on tty.
 550   virtual void print() const {
 551     print_on(tty);
 552   }
 553   // Print more detailed heap information on the given
 554   // outputStream. The default behavior is to call print_on(). It is
 555   // up to each subclass to override it and add any additional output
 556   // it needs.
 557   virtual void print_extended_on(outputStream* st) const {

 203     CMSHeap
 204   };
 205 
 206   static inline size_t filler_array_max_size() {
 207     return _filler_array_max_size;
 208   }
 209 
 210   virtual Name kind() const = 0;
 211 
 212   virtual const char* name() const = 0;
 213 
 214   /**
 215    * Returns JNI error code JNI_ENOMEM if memory could not be allocated,
 216    * and JNI_OK on success.
 217    */
 218   virtual jint initialize() = 0;
 219 
 220   // In many heaps, there will be a need to perform some initialization activities
 221   // after the Universe is fully formed, but before general heap allocation is allowed.
 222   // This is the correct place to place such initialization methods.
 223   virtual void post_initialize();
 224 
 225   // Stop any onging concurrent work and prepare for exit.
 226   virtual void stop() {}
 227 
 228   // Stop and resume concurrent GC threads interfering with safepoint operations
 229   virtual void safepoint_synchronize_begin() {}
 230   virtual void safepoint_synchronize_end() {}
 231 
 232   void initialize_reserved_region(HeapWord *start, HeapWord *end);
 233   MemRegion reserved_region() const { return _reserved; }
 234   address base() const { return (address)reserved_region().start(); }
 235 
 236   virtual size_t capacity() const = 0;
 237   virtual size_t used() const = 0;
 238 
 239   // Return "true" if the part of the heap that allocates Java
 240   // objects has reached the maximal committed limit that it can
 241   // reach, without a garbage collection.
 242   virtual bool is_maximal_no_gc() const = 0;
 243 

 518 
 519   // Requires "addr" to be the start of a chunk, and returns its size.
 520   // "addr + size" is required to be the start of a new chunk, or the end
 521   // of the active area of the heap.
 522   virtual size_t block_size(const HeapWord* addr) const = 0;
 523 
 524   // Requires "addr" to be the start of a block, and returns "TRUE" iff
 525   // the block is an object.
 526   virtual bool block_is_obj(const HeapWord* addr) const = 0;
 527 
 528   // Returns the longest time (in ms) that has elapsed since the last
 529   // time that any part of the heap was examined by a garbage collection.
 530   virtual jlong millis_since_last_gc() = 0;
 531 
 532   // Perform any cleanup actions necessary before allowing a verification.
 533   virtual void prepare_for_verify() = 0;
 534 
 535   // Generate any dumps preceding or following a full gc
 536  private:
 537   void full_gc_dump(GCTimer* timer, bool before);
 538 
 539   virtual void initialize_serviceability() = 0;
 540 
 541  public:
 542   void pre_full_gc_dump(GCTimer* timer);
 543   void post_full_gc_dump(GCTimer* timer);
 544 
 545   VirtualSpaceSummary create_heap_space_summary();
 546   GCHeapSummary create_heap_summary();
 547 
 548   MetaspaceSummary create_metaspace_summary();
 549 
 550   // Print heap information on the given outputStream.
 551   virtual void print_on(outputStream* st) const = 0;
 552   // The default behavior is to call print_on() on tty.
 553   virtual void print() const {
 554     print_on(tty);
 555   }
 556   // Print more detailed heap information on the given
 557   // outputStream. The default behavior is to call print_on(). It is
 558   // up to each subclass to override it and add any additional output
 559   // it needs.
 560   virtual void print_extended_on(outputStream* st) const {